Fix #104 by adding support for HTTP post using DataPipeFiller

examples/widgets/http_post.dart

+// Copyright 2015, the Flutter project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import 'package:flutter/http.dart' as http;
+import 'package:flutter/material.dart';
+
+void main() {
+  runApp(
+    new MaterialApp(
+      title: "HTTP POST Example",
+      routes: {
+        '/': (RouteArguments args) => const PostDemo()
+      }
+    )
+  );
+}
+
+class PostDemo extends StatefulComponent {
+  const PostDemo();
+  PostDemoState createState() => new PostDemoState();
+}
+
+class PostDemoState extends State<PostDemo> {
+
+  String _response = null;
+
+  void initState() {
+    _refresh();
+    super.initState();
+  }
+
+  void _refresh() {
+    setState(() {
+      _response = null;
+    });
+    http.post("http://httpbin.org/post", body: "asdf=42").then((http.Response response) {
+      setState(() {
+        _response = response.body;
+      });
+    });
+  }
+
+  Widget build(BuildContext context)  {
+    return new Scaffold(
+      toolBar: new ToolBar(
+        center: new Text("HTTP POST example")
+      ),
+      body: new Material(
+        child: new Block(
+          [new Text(
+            "${_response ?? 'Loading...'}",
+            style: Typography.black.body1
+          )]
+        )
+      ),
+      floatingActionButton: new FloatingActionButton(
+        child: new Icon(
+          icon: 'navigation/refresh'
+        ),
+        onPressed: _refresh
+      )
+    );
+  }
+}

packages/flutter/lib/src/http/mojo_client.dart

@@ -70,8 +70,13 @@ class MojoClient {
     mojo.UrlLoaderProxy loader = new mojo.UrlLoaderProxy.unbound();
     mojo.UrlRequest request = new mojo.UrlRequest()
       ..url = url.toString()
-      ..method = method
-      ..body = body;
+      ..method = method;
+    if (body != null) {
+      mojo.MojoDataPipe pipe = new mojo.MojoDataPipe();
+      request.body = <mojo.MojoDataPipeConsumer>[pipe.consumer];
+      ByteData data = new ByteData.view(UTF8.encode(body).buffer);
+      mojo.DataPipeFiller.fillHandle(pipe.producer, data);
+    }
     try {
       _networkService.ptr.createUrlLoader(loader);
       mojo.UrlResponse response = (await loader.ptr.start(request)).response;